/**** 
* Classes
****/ 
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		// Move the enemy in its current direction
		self.x += Math.cos(self.direction) * self.speed;
		self.y += Math.sin(self.direction) * self.speed;
		// Wrap around the screen if the enemy moves off the screen
		if (self.x < 0) {
			self.x += 2048;
		} else if (self.x > 2048) {
			self.x -= 2048;
		}
		if (self.y < 0) {
			self.y += 2732;
		} else if (self.y > 2732) {
			self.y -= 2732;
		}
		// Check for collision with other enemies
		for (var i = 0; i < enemies.length; i++) {
			if (enemies[i] !== self && self.intersects(enemies[i])) {
				// Calculate the angle of the collision
				var angle = Math.atan2(enemies[i].y - self.y, enemies[i].x - self.x);
				// Reverse the direction of the enemy
				self.direction = angle + Math.PI;
				// Push the enemy away from the other enemy
				self.x += Math.cos(self.direction) * self.speed;
				self.y += Math.sin(self.direction) * self.speed;
			}
		}
	};
});
// Explosion Fragment class
var ExplosionFragment = Container.expand(function () {
	var self = Container.call(this);
	var fragmentGraphics = self.attachAsset('fragment', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		self.x += Math.cos(self.direction) * self.speed;
		self.y += Math.sin(self.direction) * self.speed;
		self.speed *= 0.99;
		if (self.speed < 0.1) {
			var index = explosions.indexOf(self);
			if (index > -1) {
				explosions.splice(index, 1);
			}
			// Spawn particles when the fragment is removed
			for (var i = 0; i < 10; i++) {
				var particle = new Particle();
				particle.x = self.x;
				particle.y = self.y;
				// Set the direction of each particle to form a perfect circle
				particle.direction = i * (Math.PI / 4);
				game.addChild(particle);
			}
			// Play fragment explosion sound
			LK.getSound('fragmentExplosion').play();
			self.destroy();
		} else if (self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732) {
			var index = explosions.indexOf(self);
			if (index > -1) {
				explosions.splice(index, 1);
			}
			// Play fragment explosion sound
			LK.getSound('fragmentExplosion').play();
			self.destroy();
		}
	};
});
//<Assets used in the game will automatically appear here>
// Particle class
var Particle = Container.expand(function () {
	var self = Container.call(this);
	var particleGraphics = self.attachAsset('particle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.update = function () {
		self.x += Math.cos(self.direction) * self.speed;
		self.y += Math.sin(self.direction) * self.speed;
		self.alpha -= 0.01;
		if (self.alpha <= 0) {
			self.destroy();
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 //Init game with black background
});

/**** 
* Game Code
****/ 
LK.playMusic('backgroundMusic');
var background = game.attachAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 2732 / 2,
	alpha: 0.3
});
// Initialize three fragment images to represent the attempts left
var attemptsImages = [];
for (var i = 0; i < 3; i++) {
	var attemptImage = LK.getAsset('fragment', {
		anchorX: 1.0,
		anchorY: 0.0,
		x: -(i + 1) * 100,
		y: 0,
		rotation: -Math.PI / 4 // Rotate 45 degrees anticlockwise
	});
	attemptsImages.push(attemptImage);
	LK.gui.topRight.addChild(attemptImage);
}
// Initialize arrays and variables
var explosions = [];
var enemies = [];
var level = 1;
var enemySize = 100;
var attempts = 3;
var score = 0;
// Initialize score text
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Function to create an explosion
function createExplosion(x, y) {
	// Create eight explosion fragments
	for (var i = 0; i < 8; i++) {
		var fragment = new ExplosionFragment();
		fragment.x = x;
		fragment.y = y;
		// Set the direction of each fragment to form a perfect circle
		fragment.direction = i * (Math.PI / 4);
		fragment.rotation = fragment.direction;
		// Shrink the fragments as the targets shrink
		fragment.scale.set(enemySize / 100, enemySize / 100);
		explosions.push(fragment);
		game.addChild(fragment);
	}
	// Play the explosion sound
	LK.getSound('explosion').play();
}
// Function to create an enemy
function createEnemy(x, y) {
	var enemy = new Enemy();
	enemy.x = x;
	enemy.y = y;
	// Assign a random direction and speed to the enemy
	enemy.direction = Math.random() * Math.PI * 2;
	enemy.speed = Math.random() * 5 + 1;
	// Set the size of the enemy based on the enemySize variable
	enemy.scale.set(enemySize * 2 / 200, enemySize * 2 / 200);
	enemies.push(enemy);
	game.addChild(enemy);
}
// Handle screen press to create an explosion
game.down = function (x, y, obj) {
	if (attempts > 0) {
		createExplosion(x, y);
		attempts--;
		// Update the display of attempts left
		attemptsImages[attempts].visible = false;
	}
};
// Update function called every game tick
game.update = function () {
	// Update explosions
	for (var i = explosions.length - 1; i >= 0; i--) {
		if (explosions[i]) {
			explosions[i].update();
			if (explosions[i] && explosions[i].radius > 200) {
				explosions.splice(i, 1);
			}
		}
	}
	// Check for collisions between explosions and enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		for (var k = explosions.length - 1; k >= 0; k--) {
			if (enemies[j].intersects(explosions[k])) {
				createExplosion(enemies[j].x, enemies[j].y);
				enemies[j].destroy();
				enemies.splice(j, 1);
				// Increase score and update score text
				score++;
				scoreTxt.setText(score);
				if (explosions[k] instanceof ExplosionFragment) {
					explosions[k].destroy();
					explosions.splice(k, 1);
				}
				break;
			}
		}
	}
	// Start a new level when all enemies are destroyed
	if (enemies.length == 0) {
		level++;
		enemySize *= 0.9;
		attempts = 3;
		// Reset the display of attempts left
		for (var i = 0; i < 3; i++) {
			attemptsImages[i].visible = true;
		}
		// Remove all fragments
		for (var i = explosions.length - 1; i >= 0; i--) {
			if (explosions[i] instanceof ExplosionFragment) {
				explosions[i].destroy();
				explosions.splice(i, 1);
			}
		}
		// Flash the screen white
		LK.effects.flashScreen(0xffffff, 1000);
		// Scale down the background only if it's larger than 33%
		if (background.scale.x > 0.33 && background.scale.y > 0.33) {
			background.scale.x *= 0.9;
			background.scale.y *= 0.9;
		}
		// Create new enemies
		for (var i = 0; i < level * 2 + 1; i++) {
			createEnemy(Math.random() * 2048, Math.random() * 2732);
		}
	} else if (enemies.length > 0 && explosions.length == 0 && attempts == 0) {
		// If there are still enemies, no fragments left on the screen and no more attempts at creating an explosion, call game over
		LK.showGameOver();
	}
};
// Create initial enemies
createEnemy(500, 500);
createEnemy(1000, 1000);
createEnemy(1500, 1500);